"It appears the fence and particularly the gates to the pool area were wholly inadequate," Mr Fraser told the court.

"The fence as it was on the day ... was clearly not compliant with what was required."

Both parents said in evidence their children always rode bikes around the pool area and often jammed the gate open to give them more room.

Her father said his daughter had been able to open the gate unassisted but he was not concerned because she was a strong swimmer.

"By the time she could do it ... we knew they (the children) could all swim, competently and strong," he said.

Counsel representing the girl's mother and father said having a full fence around the pool probably would not have saved her.

In closing the day's hearing, Deputy State Coroner Sharon Freund said: "The most salutary lesson this coronial inquest has is that teaching your kids to swim and to swim well is no guarantee that they will be safe around the pool.